1561246 has 16 divisors (see below), whose sum is σ = 2534976.
Its totient is φ = 718336.
The previous prime is 1561243. The next prime is 1561247. The reversal of 1561246 is 6421651.
It is a self number, because there is not a number n which added to its sum of digits gives 1561246.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (1561243) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1110 + ... + 2086.
It is an arithmetic number, because the mean of its divisors is an integer number (158436).
21561246 is an apocalyptic number.
1561246 is a deficient number, since it is larger than the sum of its proper divisors (973730).
1561246 is a wasteful number, since it uses less digits than its factorization.
1561246 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1043.
The product of its digits is 1440, while the sum is 25.
The square root of 1561246 is about 1249.4982993186.
The cubic root of 1561246 is about 116.0086695859.
Adding to 1561246 its reverse (6421651), we get a palindrome (7982897).
It can be divided in two parts, 156 and 1246, that multiplied together give a triangular number (194376 = T623).
The spelling of 1561246 in words is "one million, five hundred sixty-one thousand, two hundred forty-six".